How To Reset Mac Battery. Open the Apple menu and select Shut Down or hold down the power button and select Shut Down from the pop-up menu. Wait for 15 seconds and re-plug the power cord.
Run down the battery. Apple logo should be visible once the keys are pressed. Reset the System Management Controller.
Wait for 5 seconds and press the power button to start the Mac.
Check battery health. Perhaps the simplest if theoretically most time-consuming thing you can do in an attempt to correct battery problems is first run down the battery. Get your Mac serviced. Press and hold the power button for five seconds then re-connect both the battery and the power.
